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• W2145494310 abstract "Selenium, an essential biological trace element, reduces the incidence of cancer. Our previous studies show that selenite inhibits tumor invasion by suppressing the expression of matrix metalloproteinases (MMP) -2 and -9.Methylseleninic acid (MSeA), an immediate precursor of methylselenol, inhibits tumor cell growth in vitro and mammary carcinogenesis in vivo . In this study, we demonstrate that MSeA suppresses pro-MMP-2 activation in a dose-dependent manner induced by 12- O -tetradecanoylphorbol-13-acetate (PMA), and further decreases the invasiveness of HT1080 tumor cells. Membrane type-1-MMP (MT1-MMP) is a crucial element in the process of pro-MMP-2 activation. Pro-MMP-2 binds MT1-MMP, using tissue inhibitor of metalloproteinase-2 (TIMP-2) as an adaptor, by forming a trimolecular complex on the cell surface. MSeA blocked MT1-MMP in a dose-dependent manner, but not TIMP-2 expression. MMP-9 and TIMP-1 levels were not affected by MSeA. Selenite induced a decrease in protein levels of both pro-MMPs -9 and -2, but not active forms of pro-MMP-2. MT1-MMP expression is regulated by NF-κB. Our data show that the effect of MSeA on MT1-MMP expression is mediated through suppression of NF-κB activity. Methylselenol generated by selenomethionine (SeMet) and methioninase (METase) inhibited pro-MMP-2 activation induced by PMA, confirming the effect of MSeA on pro-MMP-2 activity. Moreover, ROS production induced by PMA was partly decreased in the presence of MSeA. This suppression of ROS production may be related to diminished NF-κB activity. Thus, our results suggest that MSeA blocks tumor invasion in vitro via inhibiting pro-MMP-2 activation mediated by suppression of MT1-MMP expression, which is regulated by the NF-κB signal pathway." @default.
• W2145494310 created "2016-06-24" @default.
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• W2145494310 date "2006-10-09" @default.
• W2145494310 modified "2023-09-26" @default.
• W2145494310 title "Methylseleninic acid inhibits PMA-stimulated pro-MMP-2 activation mediated by MT1-MMP expression and further tumor invasion through suppression of NF- B activation" @default.
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• W2145494310 doi "https://doi.org/10.1093/carcin/bgl203" @default.
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